Answer :

D3xt3R
[tex]2a^2-32[/tex]

[tex]2*a^2-2*16[/tex]

[tex]2*(a^2-16)[/tex]

but we have a Difference of two square

[tex]x^2-y^2=(x+y)*(x-y)[/tex]

now you can see it very well

[tex]2*(a^2-4^2)[/tex]

so

[tex]\boxed{\boxed{2*(a-4)*(a+4)}}[/tex]